Per Mertesacker wants quick Arsenal reply

Arsene Wenger’s men were beaten 2-0 at home by West Ham on Sunday, with summer signing Petr Cech enduring an Arsenal debut to forget after the former Chelsea goalkeeper flapped at a free-kick which Cheikhou Kouyate headed in, before being left wrong- footed by a low effort from Mauro Zarate in the second-half.
The Gunners had gone into the new campaign with fresh hope for a sustained challenge following some impressive displays in pre-season, which culminated with victory for the FA Cup holders over Chelsea.